For each question, indicate whether it is best assessed by using a confidence interval, a hypothesis test, or whether statistical inference is not relevant to answer it. If inference is not relevant, explain why.
(a) What percent of US voters support instituting a national kindergarten through 12th grade math curriculum?
(b) Do basketball players hit a higher proportion of free throws when they are playing at home than when they are playing away?
(c) Do a majority of adults riding a bicycle wear a helmet?
(d) On average, were the 23 players on the 2010 Canadian Olympic hockey team older than the 23 players on the 2010 US Olympic hockey team?